164 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



longer than half the body length, the ratio i : 1-4-17 (i-6), and subequal in length to the hind 

 legs, the ratio i-o-i-i (1-08) : 1. Scape 58-64 (6i)pi long and 52-58 (55)^ wide at base ; always 

 with 4 h.s. Pedicel 76-85 (79)0. long and 43-46 (45) (i. wide ; with 10-13 ( ri '6) h.s. and a 

 sensillum placodeum. Flagellum : Flagellar segments cylindrical and 21-24JJ. wide ; segment 

 III approximately as long as segment X, both being usually longest, the ratio their lengths 

 0-9-1-1 (1-06) : 1, and the ratio width to length of segments III and IX 1 : 3-4-4-2 (3-9) and 

 1 : 3-5-4-0 (3-7) respectively. Apart from the hair-like setae, the flagellar segments also with 

 numerous apically knobbed, capitate sensory setae. The lengths of the flagellar segments and 

 the number of setae on each are given below : 





Ill 



IV 



V 



VI 



VII 



VIII 



IX 



X 



length in u. 



89-116 



73-io4 



89-107 



95-116 



85-107 



79-95 



79-92 



85-98 



(av.) 



(98) 



(92) 



(95) 



(107) 



(101) 



(89) 



(85) 



(92) 



h.s. 



6-9 



3-6 



i-3 



3-4 



2-4 



i-3 



1-2 



1-2 



(av.) 



(7-3) 



(4-4) 



(i-9) 



(37) 



(2-7) 



(i-7) 



(i-i) 



(i-6) 



set. ca. 



2-5 



2-5 



7-1 1 



8-13 



7-12 



6-12 



7-i5 



9-13 



(av.) 



(3-6) 



(4-3) 



(87) 



(ii-i) 



(IO-2) 



(9-4) 



(ii-i) 



(10-9) 



Antennal bristles well defined ; segments VIII and IX each with one ventral bristle. Segment 

 X with 3 preapical bristles, the dorsal of which is slightly shorter ; terminal segment also with 

 one apical hair-like seta. 



Thorax : 502-578 (540) u. long. Prothorax : Pronotal ridges medially interrupted as usual ; 

 lateral pronotal sclerites and post-tergites well defined. Proepisternum with a ridge-like dorsal 

 margin. Prosternum very short, triangular, 12-18 (15) jx long ; prosternal ridge 101-113 (107) y. 

 long. Prothoracic setae : Medial pronotal, lateral pronotal and post-tergital setae absent. 

 Antespiracular dorsal setae 2-4 (3-1) ; antespiracular ventral seta always 1 ; prosternal setae 

 2-3 (2-4)- 



Mesothorax : Prescutum triangular in dorsal view ; 95-113 (107)0. long and 1 16-128 (125) ^ 

 wide, the ratio being 1 : 1-1-1-3 ( I-2 )- Prescutal ridge well developed and prescutal suture 

 distinct. Scutum comparatively short and evenly sclerotized ; 55-67 (6i)jjl long, i.e. the ratio 

 lengths of prescutum to scutum 1-6-2-1 (i-8) : 1. Prealare, prealar ridge, triangular plate, 

 tegula, anterior and posterior notal wing processes well developed. Scutellum 82-98 (92)0. long 

 and 107-119 (113)^ wide, ratio 1 : 1-2-1-3 (1-23), and the ratio its length to the length of 

 scutum 1-4-1-7 (1-5) : 1. Postalare with well separated anterior and posterior postalar ridges. 

 Mesopleuron : Mesopleural ridge interrupted above the coxal articulation ; basalare slender. 

 Mesepisternum and mesepimeron well defined ; later opleurite moderately large, with a distinct 

 oval membranous area. Mesosternam : Basisternum 153-168 (162) fj. long and 198-232 (223)11 

 wide ; marginal, precoxal ridges and j r urca well developed. Mesothoracic spiracle 24-27 (26) u. 

 wide at opening, with a 43-49 (46) jx long supporting bar. Mesothoracic setae on each side : 

 Prescutal setae 1-2 (1-7) ; scutal setae 1-3 (i-8) ; scutellar setae usually 1 and occasionally 2 

 (i-i). Tegular setae 3-4 (3-7). Postmesostigmatal setae absent. Basisternal setae (stn25) 2-4 

 (3-6). 



Metathorax : Metapostnotal sclerites distinct but the metapostnotal ridge absent. Metapleural 

 ridge with the usual attenuation near the middle. Precoxal ridge weakly developed ; meta- 

 sternal apophysis distinct. Metathoracic spiracle similar to the mesothoracic. Metathoracic 

 setae on each side : Metatergal setae always 2 ; metapleural setae usually 1-2 but sometimes 

 missing on one side (av. o-8). Anterior and posterior metasternal setae 1-2 (averages 1-3 and 

 i-i respectively). 



Wings : 1260-1610 (1470) [i. long and 420-532 (490)^ wide ; alar setae absent and circular 

 sensoria could not be detected and presumably also absent. Hamulohalterae 1 10-125 ( II 9)( 1 

 long and 24-31 (28) u. wide ; with one apically hooked seta, 40-49 (46)^ long, the ratio lengths 

 of seta to the hamulohaltera being 1 : 2-4-3-0 (2-6). 



